4G8 AMPHISB^N1D.E. 



long as second, on the side of which there is a larger suboval 

 lateral chin-shield. Two hundred and forty-four to two hundred 

 and fifty-five annuli on the body, and eleven to thirteen on the 

 tail ; an annulus contains twenty-eight dorsal and twenty-four 

 ventral segments. Pectoral shields numerous, small, the medians 

 but little larger than the laterals, little longer than broad. Prae- 

 anal segments eight. Lateral, vertebral, and ventral lines feebly 

 marked. Yellowish, the segments on the posterior third of the 

 body greyish in the centre. 



millim. 



Length to vent 3<30 



Tail 15 



Diameter of body 13*5 



Paraguay. 



14, Lepidosternon onychocephalum. 



Lepidosternum onychocephalum, Boettg. Zeitschr. f. Naturw. Iviii. 

 1885, p. 224. 



Rostral rather pointed, its posterior border truncate and forming 

 a broad suture with the frontal ; latter longer than broad, larger 

 than any other head-shield except the rostral ; prsefrontal and 

 supraocular united into a single shield on each side of the frontal ; 

 two parietals, the suture they form with the frontal narrower than 

 that between the latter and the rostral ; a pair of very small occi- 

 pitals, broader than long ; eye distinct through the relatively large 

 pentagonal ocular ; three or four temporals ; two upper labials, first 

 scarcely larger than second ; two lower labials, first twice as large 

 as second. Two hundred and fifty-five annuli on the body and 

 sixteen on the tail ; an annulus contains thirty dorsal and twenty- 

 four ventral segments. The median pectoral shields considerably 

 larger than the others and elongate. Proeanal segments six. 

 Yellowish, the segments of the posterior part of the body brownish- 

 grey in the centre. 



millim. 



Length to vent 260-5 



TaU 15-5 



Diameter of body 9 



Paraguay. 



15. Lepidosternon octostegum. 



Lepidosternon octostegum, A.Dum. Cat. Meth. Rept. p. 150; Peters, 

 Mon. Berl. Ac. 1879, p. 277, pi. — . fig. 1 ; Strauch, Mel. Biol. Ac. 

 St. Petersb. xi. p. 455, 



Frontal very large, covering the greater part of the head, forming 

 a broad suture with the rostral, separating the elongate, narrow, 

 praefrontals ; a pair of minute occipitals ; eye distinct through the 

 rather large ocular, which is as much in contact with the praefrontal 

 as with the supraocular ; latter rather large, evidently representing 



